ブリストル湾における以東底曳船の1網当りの漁獲量頻度分布

概要

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1. This report deals with the type of the frequency distribution of hauls with respect to catch in tons by the Danish seiners of the flounder meal fleet in the Bristol Bay. 2. The theoretical type of the frequency distribution agreeable to the observed one was looked for by the chi square test of examining the fitness of the observed series of frequencies for the estimated ones from the linear equation of STUDENTS z on either log (x+1) or x (here x is the grade of catch in tons by a haul). 3. It is found, in general, that the frequency distribution of hauls with respect to catch in tons is normalized, only when all the boats fished in a ground so good as to supply the flounder not less than five tons by a haul on the average; otherwise the distribution is kept in the logarithmic normal or shows bimodality. 4. It is suggested that the difference between the bull trawlers and the Danish seiners with respect to the type of the frequency distribution of catch by a haul is not simply due to the difference in the fishing method itself but also due to the difference in the dependency on the mother-ship and the spacial distribution of these two types of boats in the fishing ground, consequently the probable difference between the waters fished by these two types of boats with respect to the homogeneity of the distribution of flounder population therein.
公益社団法人日本水産学会の論文